Question
Identify the odd one: 3, 5, 7, 11, 13, 17, 19,
21Solution
Given: 3, 5, 7, 11, 13, 17, 19, 21 3 → Prime 5 → Prime 7 → Prime 11 → Prime 13 → Prime 17 → Prime 19 → Prime 21 → Not prime All numbers except 21 are prime numbers. So, 21 is odd one out. Thus, correct option is (a).Â
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